Schleiermacher is not an easy (or, ironically, heart-warming) read. But still he is usually less painful to approach than the bulk of the secondary literature on him, which tends to be extraordinarily dusty and confusing. The Christian Faith is still in print; and Keith Clements's Friedrich Schleiermacher: Pioneer of Modern Theology provides a useful selection of some other key texts, along with a good introduction and notes.

Two other books worth pursuing are J. Gresham Machen's Christianity and Liberalism, an almost painfully penetrating critique of Scheiermacher's liberal heritage; and from the opposite point of view, James Barr's Fundamentalism is an equally thought-provoking condemnation of conservative theology for, among other things, what Barr sees as an almost universal capitulation to Schleiermacher's legacy.